Floribunda rose plant named ‘KORtragoso’

ABSTRACT

‘KORtragoso’ is a new and distinct variety of  Rosa hybrida  which is characterized by the combination of a compact and bushy growth habit, dark green and semi-glossy foliage, excellent resistance to common rose diseases, and double-type flowers borne in panicles of up to 8 blooms. The small flowers are held upright and exhibit yellow petals with a red petal edge and a light fruity fragrance. The new variety propagates successfully by stem cuttings and grafting and has shown to be uniform and stable in the resulting generations from asexual propagation.

Latin name of genus and species: The Latin name of the genus and speciesof the novel variety disclosed herein is Rosa hybrida.

Variety denomination: The inventive variety of Rosa hybrida disclosedherein has been given the variety denomination ‘KORtragoso’.

PRIOR DISCLOSURES BY THE INVENTOR

The first public disclosure of the claimed plant was made on Sep. 20,2015 in the inventor's mail order catalog. ‘KORtragoso’ was notpublically available or sold prior to one year before the date of theinstant application.

BACKGROUND OF THE INVENTION

Parentage: The Rosa hybrida variety ‘KORtragoso’ is the result of acontrolled cross-pollination breeding program carried out by theinventor in Klein Offenseth-Sparrieshoop, Germany. The objective of thesaid breeding program was to create a new and distinct rose plant withunique qualities, such as:

-   -   1. Uniform growth and flowering; and    -   2. Abundant, recurrent yellow and red bicolor flowers; and    -   3. Attractive and abundant foliage; and    -   4. Resistance to diseases encountered in landscapes and gardens.        This combination of qualities is not present in prior rose        cultivars known to the inventor. These objectives have been        substantially achieved and in that distinguish ‘KORtragoso’ from        all other varieties known to the inventor.

‘KORtragoso’ is a seedling selection which resulted from the controlledpollination of an unnamed Rosa hybrida breeding line, the seed parent,with another unnamed Rosa hybrida breeding line, the pollen parent,during the summer of 2005. Both breeding lines were developed and ownedby the same inventor. As part of a rose development program, Tim-HermannKordes germinated seeds from the aforementioned hybridization during thefollowing winter and conducted evaluations and observations on theresulting seedlings in a controlled environment in KleinOffenseth-Sparrieshoop, Germany. The resulting seedlings exhibiteddistinctive physical and biological characteristics. The new rose plantwas selected as a single plant in May of 2006 from the seedling beds dueto its superior characteristics and asexually propagated for furtherevaluation. This new and distinctive rose variety was given the name‘KORtragoso’.

Asexual Reproduction: ‘KORtragoso’ was first asexually propagated by budgrafting in July of 2006 at the inventor's nursery in KleinOffenseth-Sparrieshoop, Germany. Subsequently, ‘KORtragoso’ has beensuccessfully propagated by stem cuttings and bud grafting in JacksonCounty, Oreg. These initial and other subsequent propagations conductedin controlled environments demonstrate that ‘KORtragoso’ reproduces trueto type in successive generations of asexual reproduction.

SUMMARY OF THE INVENTION

The following characteristics have been repeatedly observed andrepresent the distinguishing characteristics of the new Rosa hybridacultivar ‘KORtragoso’. These traits, in combination, distinguish‘KORtragoso’ as a new and distinct cultivar.

-   -   1. Rosa hybrida ‘KORtragoso’ exhibits a compact, bushy growth        habit; and    -   2. Rosa hybrida ‘KORtragoso’ exhibits dark green and semi-glossy        foliage; and    -   3. Rosa hybrida ‘KORtragoso’ exhibits excellent resistance to        common rose diseases; and    -   4. Rosa hybrida ‘KORtragoso’ exhibits yellow flowers with red        petal edges, borne in clusters, held upright; and    -   5. Rosa hybrida ‘KORtragoso’ exhibits double flowers of small        size for a floribunda rose; and.    -   6. Rosa hybrida ‘KORtragoso’ exhibits flowers with a light        fruity fragrance.

BRIEF DESCRIPTION OF THE DRAWING

The accompanying color drawing shows as true as is reasonably possibleto obtain in color photographs of this type, the typical characteristicsof the buds, sepals, reproductive organs, flowers, leaves, prickles, andstems of ‘KORtragoso’, taken from a two year old plant.

DETAILED BOTANICAL DESCRIPTION

The following is a detailed botanical description of a new and distinctvariety of Rosa hybrida known as ‘KORtragoso’, based upon observationsmade in October of 2015 from two year old own-root plants grown outdoorsin Jackson County, Oreg. Those skilled in the art will appreciate thatcertain characteristics will vary with older or, conversely, withyounger plants. ‘KORtragoso’ has not been observed under all possibleenvironmental conditions. Where dimensions, sizes, colors and othercharacteristics are given, it is to be understood that suchcharacteristics are approximations or averages set forth as accuratelyas practicable. The phenotype of the variety may differ from thedescriptions set forth herein with variations in environmental, climaticand cultural conditions. Color notations are based on The RoyalHorticultural Society Colour Chart, The Royal Horticultural Society,London, 2001 edition except where common terms of color are used.

A botanical description of ‘KORtragoso’ and comparisons with othervarieties of Rosa hybrida are provided below.

-   General plant description:    -   -   Growth rate.—Moderate.        -   Growth habit.—Compact and bushy.        -   Mature dimensions.—90 cm tall and 60 cm wide, on average,            when grown as a field plant.        -   Cold hardiness.—Grown successfully in USDA Hardiness Zone 6.        -   Propagation.—Stem cuttings and bud grafting.        -   Disease resistance.—Excellent resistance to Powdery mildew            (Sphaerotheca pannosa), blackspot (Diplocarpon rosae), rust            (Phragmidium sp.), and Botrytis (Botrytis cinerea) diseases            under normal growing conditions in Jackson County, Oreg.-   Root system: Fibrous.-   Stems:    -   -   Stem color.—Young stems are Yellow-Green Group 146C; mature            stems are Yellow-Green Group 146B.        -   Anthocyanin intonations.—Slight intonations of Greyed-Purple            Group 187C are primarily present on young stems only.        -   Stem surface texture.—Both young stems and mature stems are            smooth.        -   Stem dimensions.—Typical mature stems are approximately 60            to 90 cm long and 8 mm in diameter.        -   Prickles.—Incidence — Typically 22 prickles per 10 cm of            stem on young wood, and 6 prickles per 10 cm of stem on            mature stems, on average. Mature size — Average length is 7            mm long. Immature prickle color — Greyed-Orange Group N167A.            Mature prickle color — Greyed-Orange Group 166B. Anthocyanin            intonations — None. Shape — Deeply concave. Texture —            Smooth.-   Leaves:    -   -   Arrangement.—Imparipinnate compound leaves; mature axillary            leaves normally with 7 leaflets.        -   Attachment.—Petiolate.        -   Dimensions.—130 mm long and 85 mm wide.        -   Abundance.—Average; approximately 60 leaves.        -   Stipules.—Size — 15 mm long and 5 mm wide. Stipule color —            Yellow-Green Group 146A. Anthocyanin intonations —            Intonations of Greyed-Purple Group 185C present on the            central region of the adaxial surface; occasionally present            on the central region of the abaxial surface. Stipitate            glands — Abundant on the abaxial surface and margins.            Margins — Dentate with stipitate glands. Texture, adaxial            surfaces — Glabrous. Texture, abaxial surfaces — Glabrous.            Apex — Apiculate. Base — Flat; fused to the petiole.        -   Petiole.—Dimensions — 15 mm long and 2.0 mm in diameter.            Petiole color, adaxial surface — Yellow-Green Group 146B.            Petiole color, abaxial surface — Yellow-Green Group 146C.            Anthocyanin intonations — Greyed-Purple Group 184D present            on the center portion of the adaxial surface. Margins —            Stipitate glands present. Prickles — One prickle is present.            Stipitate glands — A limited number of stipitate glands are            present on the adaxial portion of the margins and also on            the abaxial surface. Surface — Glabrous. Strength — Strong.        -   Rachis.—Length — Average 20 mm. Diameter — Average 1.5 mm.            Color — Yellow-Green Group 146B. Anthocyanin intonations —            Intonations of Greyed-Purple Group 183C are present on the            adaxial portion of the margins and at the point of leaf            attachment. Margins — Occasional stipitate glands. Prickles            — A few small prickles underneath. Stipitate glands — A            limited number of stipitate glands are present. Surfaces —            Matte.        -   Leaflets.—Dimensions — Average size of the terminal leaflet            is 55 mm long and 35 mm wide. Shape — Ovate. Apex — Acute.            Base — Obtuse. Margins — Finely serrated; not undulated.            Luster, texture and pubescence; adaxial surface —            Semi-glossy, rugose, and glabrous. Luster, texture and            pubescence; abaxial surface — Matte, rugose, and glabrous.            Juvenile foliage color, adaxial surface — Yellow-Green Group            146A. Juvenile foliage color, abaxial surface — Yellow-Green            Group 146B. Mature foliage color, adaxial surface — Green            Group 137A. Mature foliage color, abaxial surface —            Yellow-Green Group 146B. Anthocyanin intonations —            Intonations of Greyed-Purple Group 183A present across the            entire leaf surface of juvenile foliage and stems. Venation            — Reticulate. Petiolule — Dimensions — 3 mm long and 1 mm in            diameter. Petiolule color, adaxial surface — Yellow-Green            Group 146B. Petiolule color, abaxial surface — Yellow-Green            Group 146D. Anthocyanin intonations — Intonations of            Greyed-Purple Group 183C are present on the adaxial surface            of the margins. Prickles — None. Texture, adaxial and            abaxial surfaces — Leathery.-   Inflorescence:    -   -   Inflorescence type.—Panicles with generally 3 to 8 flowers            which are held upright.        -   Blooming habit.—Recurrent; floriferous.        -   Size.—250 mm high and 120 mm wide, on average.        -   Peduncle.—Length — 60 to 80 mm average length. Diameter — 3            to 4.5 mm average diameter. Color — Yellow-Green Group 146C.            Anthocyanin intonations — Intonations of Greyed-Red Group            178C. Strength — Stony. Texture — Smooth, with a limited            number of stipitate glands.-   Flowering laterals: Generally 1 to 2 flowering laterals are present,    each with one flower per flowering shoot.-   Bud:    -   -   Bud form.—Short; globular.        -   Size.—Upon opening, 30 mm in length from base of receptacle            to distal end of bud and 15 mm diameter at its widest point.        -   Texture.—Smooth.        -   Color, as sepals first unfold.—Red Group 46B to Red Group            53A.        -   Color when one-quarter open, inner side.—Marginal zone — Red            Group 46R Middle zone — Yellow-Orange Group 14B. Basal zone            — Yellow-Orange Group 14B.        -   Color when one-quarter open, outer side.—Marginal zone — Red            Group 46A to 46C. Middle zone — Red Group 46A to 46C. Basal            zone — Red Group 46A to 46C.-   Flower:    -   -   Pedicels.—Surface — Fine hairs and stipitate glands are            present. Length — 60 to 120 mm, on average. Diameter — 2 to            3 mm, on average. Color — Greyed-Purple Group 133A. Strength            — Strong to somewhat strong. Texture — Rugose.        -   Calyx.—General — Comprised of five polysepalous sepals, with            very weak foliaceous appendages occasionally present on one            to two of the sepals. Diameter — 55 mm. Sepals — Color,            upper surface — Yellow-Green Group 146C to 146D. Color,            lower surface — Yellow-Green Group 146B. Anthocyanin            intonations, upper surface — Strong intonations of Greyed            Purple 183D. Anthocyanin intonations, lower surface — Strong            intonations of Greyed-Purple Group 184B. Size — 25 mm long            and 8 mm wide, on average. Apex — Apiculate. Base — Flat at            union with receptacle. Quantity — Five; occasionally six.            Upper surface — Strong pubescent. Lower surface — Pubescent,            with stipitate glands. Stipitate glands — Moderate density.            Margins — Fine hairs with some stipitate glands present.        -   Corolla.—General shape of corolla — Shallow cup. Shape of            corolla when viewed from the side — Upon opening, upper            portion — Flat. Upon opening, lower portion — Flat. Open            flower, upper portion — Flattened convex. Open flower, lower            portion — Flattened convex. Dimensions — Small size for a            floribunda rose. At anthesis, the average flower diameter is            65 mm and the average flower height is 35 mm. Fragrance —            Very light fruity fragrance. Duration — On the plant for            approximately 1 to 5 days. Senesced petals drop away            cleanly. Petals — Petal count — Exhibits double flowers with            an average of 25 to 30 petals under normal conditions. Petal            reflex — Petals are somewhat reflexed. Timing of petal            reflex — Simultaneous. Petal margin — Entire; slightly            undulated. Petal shape — Ovate. Apex — Obtuse. Base — Obtuse            Dimensions — 20 to 25 mm long and 20 to 35 mm wide. Texture,            inner and outer surfaces — Smooth. Petal color, upon opening            — Outermost petals, inner surface — Marginal zone — Red            Group 46A to 46B. Middle zone — Yellow-Orange Group 14A,            with intonations of Red Group 46D. Basal zone —            Yellow-Orange Group 14A. Outermost petals, outer surface —            Marginal zone — Red Group 46B to 46C. Middle zone —            Yellow-Orange Group 14B, with strong intonations of Red            Group 46B and 46C. Basal zone — Yellow-Orange Group 14B.            Innermost petals, inner surface — Marginal zone —            Yellow-Orange Group 14A, with intonations of Red Group 44B.            Middle zone — Yellow-Orange Group 14A. Basal zone —            Yellow-Orange Group 14A. Innermost petals, outer surface —            Marginal zone — Yellow-Orange Group 14B, with intonations of            Red Group 46A. Middle zone — Yellow-Orange Group 14B. Basal            zone — Yellow-Orange Group 14B. Basal petal spots, upon            opening — No distinct basal petal spots. Petal color, after            opening — Outermost petals, inner surface — Marginal zone —            Red Group 53C. Middle zone — Red Group 43C to 43D. Basal            zone — Yellow Group 3C. Outermost petals, outer surface —            Marginal zone — Red Group 46C. Middle zone — Red Group 46C.            Basal zone — Yellow Group 2A. Innermost petals, inner            surface — Marginal zone — Red Group 37B. Middle zone —            Yellow Group 9B. Basal zone — Yellow Group 9B. Innermost            petals, outer surface — Marginal zone — Orange Group 26D.            Middle zone — Yellow Group 10A. Basal zone — Yellow Group            10A. Basal petal spots, after opening — No distinct basal            petal spots. General Tonality — On open flower,            Yellow-Orange Group 16B and edged with Red Group 43B. No            change in general tonality at the end of the third day;            thereafter the general tonality is Red Group 46B.        -   Petaloids.—Quantity — 8 petaloids per flower, on average.            Dimensions — Variable; ranging from 10 to 18 mm long and 5            to 8 mm wide. Color, inner surface — Yellow-Orange Group            14A, with intonations of Orange-Red Group 38B. Color, outer            surface — Yellow-Orange Group 14B, with intonations of            Orange Group 28C. Margins — Very irregular; entire to            undulated to indented. Shape — Spatulate to ovate. Apex —            Acute to obtuse. Base — Cuneate to attenuate. Texture, inner            and outer surfaces — Smooth.-   Reproductive organs:    -   -   Stamens.—Quantity — Approximately 65, on average; regularly            arranged around the styles. Anthers — Shape — Reniform.            Dimensions — 1 mm long and 0.5 mm wide, on average. Color —            Yellow-Orange Group 26A. Pollen — Generally present; medium            density. Color is Greyed-Orange Group N167B. Filaments —            Color — Yellow-Orange Group 17A. Length — 5 mm.        -   Pistils.—Quantity — Abundant; approximately 70. Stigmas —            Size — 1 mm. Location — Slightly inferior in position to            anthers. Color — Greyed-Yellow Group 1B. Styles — Length —            Approximately 4 mm long. Color — Yellow-Green Group 149D.        -   Ovary.—Dimensions — 5 mm long and 6 mm wide. Color — White            Group 155C.        -   Receptacle.—Shape — Funnel-shaped. Dimensions —            Approximately 8 mm high and 10 mm wide. Surface — Glabrous            and smooth, with a limited number of stipitate glands. Color            — Yellow-Green Group 147C, with intonations of Greyed-Purple            Group 187B which nearly cover the entire receptacle.-   Hips and seed formation: Unknown.

COMPARISONS WITH THE PARENTS

The new rose plant may be distinguished from its seed parent, aproprietary Rosa hybrida breeding line developed by the same inventor,by the following combination of characteristics:

-   -   1. ‘KORtragoso’ exhibits yellow flowers with red petal edges,        whereas the seed parent exhibits yellow flowers with pink petal        edges.    -   2. ‘KORtragoso’ exhibits a double flower petal count, whereas        the seed parent exhibits a semi-double flower count.    -   3. The flowers of ‘KORtragoso’ are larger than those of the seed        parent.

The new rose plant may be distinguished from its pollen parent, aproprietary Rosa hybrida breeding line developed by the same inventor,by the following combination of characteristics:

-   -   1. ‘KORtragoso’ exhibits yellow flowers with red petal edges,        whereas the pollen parent exhibits solid yellow flowers.    -   2. The flowers of ‘KORtragoso’ are larger than those of the        pollen parent.

COMPARISON WITH THE MOST SIMILAR ROSA CULTIVAR KNOWN TO THE INVENTOR

For a comparison, several physical characteristics of the Rosa hybridavariety ‘KORfizzlem’, a rose variety from the same inventor which isdescribed and illustrated in U.S. Plant Pat. No. 24,195, are compared to‘KORtragoso’ in Chart 1.

CHART 1 Characteristic ‘KORtragoso’ ‘KORfizzlem’ General tonality ofYellow-Orange Group Yellow Group 13C. flower, atanthesis. 16B with petaledges Red Group 43B. Average petal count, 25 to 30. 5. at anthesis.Plant habit and size. Compact and bushy. Upright to bushy. AverageAverage plant height 90 plant height 120 cm and cm and average plantaverage plant width 80 width 60 cm. cm.

That which is claimed:
 1. A new and distinct variety of rose plant named‘KORtragoso’, as described and illustrated herein.